SIPC-232 — Control connection attempt unsuccessful
The SIP proxy has tried to connect to next-hop proxy or server and this attempt failed.
The D-level message means temporary failure, the proxy will continue connecting later on.
The E-level message means really an error, the proxy will reject the request. However, further client attempts may succeed.
The C-level message means that the proxy or the system are in suspicious state and if this message repeats, the state should be checked.